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	<meta charset="utf-8"> 
	<title>菜鸟教程(runoob.com)</title> 
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	<script>
		function changeImage()
		{
			element=document.getElementById('myimage')
			if (element.src.match("bulbon"))
			{
				element.src="images/pic_bulboff.gif";
			}
			else
			{
				element.src="images/pic_bulbon.gif";
			}
		}
	</script>
	<img id="myimage" onclick="changeImage()" src="images/pic_bulboff.gif" width="100" height="180">
	<p>点击灯泡就可以打开或关闭这盏灯</p>
	
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